text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The WJN developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  #ifndef BITCOIN_TXDB_LEVELDB_H
  #define BITCOIN_TXDB_LEVELDB_H
  
  #include "main.h"
  #include "leveldb.h"
  
  /** CCoinsView backed by the LevelDB coin database (chainstate/) */
  class CCoinsViewDB : public CCoinsView
  {
  protected:
      CLevelDB db;
  public:
      CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
  
      bool GetCoins(const uint256 &txid, CCoins &coins);
      bool SetCoins(const uint256 &txid, const CCoins &coins);
      bool HaveCoins(const uint256 &txid);
      CBlockIndex *GetBestBlock();
      bool SetBestBlock(CBlockIndex *pindex);
      bool BatchWrite(const std::map<uint256, CCoins> &mapCoins, CBlockIndex *pindex);
      bool GetStats(CCoinsStats &stats);
  };
  
  /** Access to the block database (blocks/index/) */
  class CBlockTreeDB : public CLevelDB
  {
  public:
      CBlockTreeDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
  private:
      CBlockTreeDB(const CBlockTreeDB&);
      void operator=(const CBlockTreeDB&);
  public:
      bool WriteBlockIndex(const CDiskBlockIndex& blockindex);
      bool ReadBestInvalidWork(CBigNum& bnBestInvalidWork);
      bool WriteBestInvalidWork(const CBigNum& bnBestInvalidWork);
      bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
      bool WriteBlockFileInfo(int nFile, const CBlockFileInfo &fileinfo);
      bool ReadLastBlockFile(int &nFile);
      bool WriteLastBlockFile(int nFile);
      bool WriteReindexing(bool fReindex);
      bool ReadReindexing(bool &fReindex);
      bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
      bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &list);
      bool WriteFlag(const std::string &name, bool fValue);
      bool ReadFlag(const std::string &name, bool &fValue);
      bool LoadBlockIndexGuts();
  };
  
  #endif // BITCOIN_TXDB_LEVELDB_H
  